Keep using Panther. When Tiger arrives, clone your system to an external drive using SuperDuper (just in case - or at least your user folder) and do an Archive & Install checking the box that offers to move your user settings/apps. With a new system, you're not going to have cluttered things up too much.

This will effectively give you a clean System install and then copy over the apps/user files that you'd otherwise have to copy over yourself. Took about 45 minutes total on my Powerbook and no problems here. Wait a week or so and then delete the Previous System folder. If you experience any problems, you can always do a clean install later.

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